5.11 External Audio Synchronization - Studer OnAir 3000 Operating Instructions Manual

OnAir 3000 Digital Mixing Console

5.11 External Audio Synchronization

Auto Select
5-136 Operation
The audio synchronization source may be internal or external. For external
synchronization, the type of available external synchronization signal(s),
i.e., the sync source, must be defined with the configuration tool
6.5.34). The different sync signals are fed to the system via the SCore's Audio
Clock card.
Available Sync Sources
INTERNAL
AES/EBU
WORDCLOCK
VIDEO, 25 frm/s*
VIDEO, 29.97 frm/s*
This is a function accessible in the configuration tool (see
defines the behavior of the console if the external clock should fail.
If 'Auto Select Off' is configured, the console will automatically switch to
its internal clock whenever the external sync source signal is missing, except
if the selected external sync source is 'video' – then the selection remains in
video mode. In any case a message box is displayed, and a warning (Missing
External Clock) is added to the error list. As soon as a valid external clock
signal is available again, the console is re-synchronized.
If 'Auto Select On' is configured, the external sync source is automatically
selected according to the priority given in the table below. As soon as a valid
external clock signal with a higher priority is available again, the console is
re-synchronized to that signal.
Priority
1
2
3
4
Notes: The Audio Clock card must not be removed from the system as long as the
latter is powered on; otherwise, the DSP cards will indicate 'fail', and the
audio signal will neither be audible nor processed.
DIP switches on the Audio Clock card allow selecting either high impedance
(OFF) or 75 Ω termination (ON) for the video and wordclock inputs individu-
ally.
SW V6.0
Possible Sampling Rates OnAir 3000
* NO drop frame sources allowed/possible
Audio Clock (Sync) Source
Video Clock
AES/EBU Clock
Word Clock
Internal
(see chapter
44.1 / 48 kHz ±100 ppm (default)
44.1 / 48 kHz
44.1 / 48 kHz
44.1 / 48 kHz
44.1 / 48 kHz
chapter
Document generated: 10.10.14
6.5.34). It